Peroneus

Peroneus (also known as fibularis) is a group of muscles in the lower leg that are involved in the movement of the foot. The group consists of three muscles: the Peroneus Longus, the Peroneus Brevis, and the Peroneus Tertius.

Anatomy

The peroneus muscles originate from the lower two-thirds of the fibula and the interosseous membrane. They run down the lateral side of the leg and across the ankle joint, attaching to various parts of the foot.

Peroneus Longus

The Peroneus Longus originates from the head and upper part of the fibula. It runs obliquely downwards and laterally, and its tendon passes behind the lateral malleolus and under the foot to attach to the medial cuneiform and first metatarsal bones.

Peroneus Brevis

The Peroneus Brevis originates from the lower two-thirds of the fibula. Its tendon runs behind the lateral malleolus and attaches to the base of the fifth metatarsal bone.

Peroneus Tertius

The Peroneus Tertius is the smallest of the three muscles. It originates from the lower third of the fibula and the interosseous membrane. Its tendon runs in front of the lateral malleolus and attaches to the base of the fifth metatarsal bone.

Function

The peroneus muscles are involved in eversion and plantar flexion of the foot. They also provide lateral stability to the ankle.

Clinical significance

Injury to the peroneus muscles or their tendons can result in foot and ankle problems, including ankle sprains and foot drop. Treatment may involve physiotherapy, medication, or in severe cases, surgery.

See also

• Ankle
• Foot
• Muscular system
• Human anatomy

Peroneus Resources
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